Method for catalyzing and preparing 2, 6-dimethylnaphalene by utilizing SAPO-31 molecular sieve
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A technology of SAPO-31 and dimethylnaphthalene, which is applied in the field of preparation 2, can solve the problems of low selectivity and small ratio, and achieve the effects of simple operation, easy separation, and difficult inactivation
Inactive Publication Date: 2014-06-11
HEILONGJIANG UNIV
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[0005] The present invention solves the problems of low selectivity to the target product 2,6-DMN and small ratio of 2,6-DMN / 2,7-DMN in the existing method for continuously preparing 2,6-dimethylnaphthalene, and provides a A kind of method utilizing SAPO-31 molecular sieve to catalyze the preparation of 2,6-dimethylnaphthalene
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specific Embodiment approach 1
[0008] Specific embodiment one: this embodiment is a kind of method that utilizes SAPO-31 molecular sieve to catalyze the preparation of 2,6-dimethylnaphthalene, specifically completes according to the following steps:
[0009] One, preparation of raw material liquid: the raw material of naphthalene, alkylation reagent and solvent are mixed uniformly, promptly obtains raw material liquid; Two, alkylation reaction: at first silicon-aluminum ratio (SiO 2 / Al 2 o 3 ) is 0.3 ~ 0.7, 20 ~ 40 mesh SAPO-31 molecular sieves are loaded into the fixed bed reactor, and the temperature is 400 ℃ ~ 600 ℃, the carrier gas is nitrogen, and the carrier gas flow rate is 50ml / min ~ 100ml / min. Activation at high temperature for 40min to 120min, then inject the raw material solution prepared in step 1 into the fixed bed reactor by continuous injection, and in the temperature range of 350°C to 450°C, the pressure of 2MPa to 5MPa, and the mass space velocity of 0.5h -1 ~2h -1 , The carrier gas is ...
specific Embodiment approach 2
[0041] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the naphthalene raw material described in step one is the mixing of naphthalene, β-methylnaphthalene or β-methylnaphthalene and α-methylnaphthalene in any ratio Methylnaphthalene. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0042] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the alkylating agent described in step 1 is methanol. Others are the same as in the first or second embodiment.
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Abstract
A method for catalyzing and preparing 2, 6-dimethylnaphalene by utilizing an SAPO-31 molecular sieve relates to a method for preparing the 2, 6-dimethylnaphalene and aims at solving the problems of low selectivity of target product 2, 6-dimethylnitrosamine (DMN) and small ratio of 2, 6-DMN to 2, 7-DMN by means of an existing method for preparing the 2, 6-dimethylnaphalene continuously. The method comprises the steps of mixing raw materials to produce raw material liquid, performing alkylation reaction by adopting the SAPO-31 molecular sieve to produce a reaction product, and finally performing separation through eutectic melting crystallization to produce the 2, 6-dimethylnaphalene. The method has the advantages that 1 the selectivity of target product 2, 6-DMN is 30%-60%, the ratio of 2, 6-DMN to 2, 7-DMN is 2-9, and purity of produced 2, 6-DMN is 55%-90%, and 2 the reaction product and catalyst are easily separated and the production cost is reduced. The method is mainly used for preparing the 2, 6-dimethylnaphalen.
Description
technical field [0001] The invention relates to a method for preparing 2,6-dimethylnaphthalene. Background technique [0002] 2,6-Dimethylnaphthalene (2,6-DMN) is the key raw material for the preparation of polyethylene naphthalate (PEN) polymerized monomer 2,6-naphthalene dicarboxylic acid, and PEN is a potential Compared with polyethylene terephthalate (PET), PEN has superior heat resistance, mechanical properties, chemical stability, gas barrier and resistance to ultraviolet rays and radiation. Performance, can replace PET in the manufacturing industries of electronic components, instruments and meters, insulating materials, fibers, films, video tapes, disks, food packaging, impact-resistant packaging for precision instruments, beer bottles, aerospace and atomic energy materials, etc. The application prospects are very broad. It is one of the fastest developed and applied polymer materials in the past 10 years. [0003] At present, the preparation methods of 2,6-DMN mai...
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